This driver is a counterpart of drivers/mmc/host/sdhci-cadence.c from Linux. Some updates for v4.12-rc1 can be imported to U-Boot.

- Fix value of SDHCI_CDNS_HRS04_RDATA_SHIFT - Add polling for ACK bit to be sure that data are written to the PHY register - Retrieve PHY values from DT properties instead of fixed data

The following is the list of upstream commits:

- Linux commit 4e03f628b464e0580abadf5161eaa38c61d20943 mmc: sdhci-cadence: fix bit shift of read data from PHY port

- Linux commit a0f8243229ed071c8da0ea7cedc1b7bf1b1515da mmc: sdhci-cadence: Fix writing PHY delay

- Linux a89c472d8b55c5afc4c79e6e3d1338730034eb01 mmc: sdhci-cadence: Update PHY delay configuration

Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com ---

drivers/mmc/sdhci-cadence.c | 67 ++++++++++++++++++++++++++++++++++++++------- 1 file changed, 57 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/sdhci-cadence.c b/drivers/mmc/sdhci-cadence.c index 2253bbc..dc86d10 100644 --- a/drivers/mmc/sdhci-cadence.c +++ b/drivers/mmc/sdhci-cadence.c @@ -7,8 +7,10 @@

#include <common.h> #include <linux/io.h> +#include <linux/iopoll.h> #include <linux/sizes.h> #include <dm/device.h> +#include <libfdt.h> #include <mmc.h> #include <sdhci.h>

@@ -17,7 +19,7 @@ #define SDHCI_CDNS_HRS04_ACK BIT(26) #define SDHCI_CDNS_HRS04_RD BIT(25) #define SDHCI_CDNS_HRS04_WR BIT(24) -#define SDHCI_CDNS_HRS04_RDATA_SHIFT 12 +#define SDHCI_CDNS_HRS04_RDATA_SHIFT 16 #define SDHCI_CDNS_HRS04_WDATA_SHIFT 8 #define SDHCI_CDNS_HRS04_ADDR_SHIFT 0

@@ -34,6 +36,9 @@ #define SDHCI_CDNS_PHY_DLY_EMMC_LEGACY 0x06 #define SDHCI_CDNS_PHY_DLY_EMMC_SDR 0x07 #define SDHCI_CDNS_PHY_DLY_EMMC_DDR 0x08 +#define SDHCI_CDNS_PHY_DLY_SDCLK 0x0b +#define SDHCI_CDNS_PHY_DLY_HSMMC 0x0c +#define SDHCI_CDNS_PHY_DLY_STROBE 0x0d

struct sdhci_cdns_plat { struct mmc_config cfg; @@ -41,11 +46,31 @@ struct sdhci_cdns_plat { void __iomem *hrs_addr; };

-static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_plat *plat, - u8 addr, u8 data) +struct sdhci_cdns_phy_cfg { + const char *property; + u8 addr; +}; + +static const struct sdhci_cdns_phy_cfg sdhci_cdns_phy_cfgs[] = { + { "cdns,phy-input-delay-sd-highspeed", SDHCI_CDNS_PHY_DLY_SD_HS, }, + { "cdns,phy-input-delay-legacy", SDHCI_CDNS_PHY_DLY_SD_DEFAULT, }, + { "cdns,phy-input-delay-sd-uhs-sdr12", SDHCI_CDNS_PHY_DLY_UHS_SDR12, }, + { "cdns,phy-input-delay-sd-uhs-sdr25", SDHCI_CDNS_PHY_DLY_UHS_SDR25, }, + { "cdns,phy-input-delay-sd-uhs-sdr50", SDHCI_CDNS_PHY_DLY_UHS_SDR50, }, + { "cdns,phy-input-delay-sd-uhs-ddr50", SDHCI_CDNS_PHY_DLY_UHS_DDR50, }, + { "cdns,phy-input-delay-mmc-highspeed", SDHCI_CDNS_PHY_DLY_EMMC_SDR, }, + { "cdns,phy-input-delay-mmc-ddr", SDHCI_CDNS_PHY_DLY_EMMC_DDR, }, + { "cdns,phy-dll-delay-sdclk", SDHCI_CDNS_PHY_DLY_SDCLK, }, + { "cdns,phy-dll-delay-sdclk-hsmmc", SDHCI_CDNS_PHY_DLY_HSMMC, }, + { "cdns,phy-dll-delay-strobe", SDHCI_CDNS_PHY_DLY_STROBE, }, +}; + +static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_plat *plat, + u8 addr, u8 data) { void __iomem *reg = plat->hrs_addr + SDHCI_CDNS_HRS04; u32 tmp; + int ret;

tmp = (data << SDHCI_CDNS_HRS04_WDATA_SHIFT) | (addr << SDHCI_CDNS_HRS04_ADDR_SHIFT); @@ -54,17 +79,36 @@ static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_plat *plat, tmp |= SDHCI_CDNS_HRS04_WR; writel(tmp, reg);

+ ret = readl_poll_timeout(reg, tmp, tmp & SDHCI_CDNS_HRS04_ACK, 10); + if (ret) + return ret; + tmp &= ~SDHCI_CDNS_HRS04_WR; writel(tmp, reg); + + return 0; }

-static void sdhci_cdns_phy_init(struct sdhci_cdns_plat *plat) +static int sdhci_cdns_phy_init(struct sdhci_cdns_plat *plat, + const void *fdt, int nodeoffset) { - sdhci_cdns_write_phy_reg(plat, SDHCI_CDNS_PHY_DLY_SD_HS, 4); - sdhci_cdns_write_phy_reg(plat, SDHCI_CDNS_PHY_DLY_SD_DEFAULT, 4); - sdhci_cdns_write_phy_reg(plat, SDHCI_CDNS_PHY_DLY_EMMC_LEGACY, 9); - sdhci_cdns_write_phy_reg(plat, SDHCI_CDNS_PHY_DLY_EMMC_SDR, 2); - sdhci_cdns_write_phy_reg(plat, SDHCI_CDNS_PHY_DLY_EMMC_DDR, 3); + const u32 *prop; + int ret, i; + + for (i = 0; i < ARRAY_SIZE(sdhci_cdns_phy_cfgs); i++) { + prop = fdt_getprop(fdt, nodeoffset, + sdhci_cdns_phy_cfgs[i].property, NULL); + if (!prop) + continue; + + ret = sdhci_cdns_write_phy_reg(plat, + sdhci_cdns_phy_cfgs[i].addr, + fdt32_to_cpu(*prop)); + if (ret) + return ret; + } + + return 0; }

static int sdhci_cdns_bind(struct udevice *dev) @@ -76,6 +120,7 @@ static int sdhci_cdns_bind(struct udevice *dev)

static int sdhci_cdns_probe(struct udevice *dev) { + DECLARE_GLOBAL_DATA_PTR; struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev); struct sdhci_cdns_plat *plat = dev_get_platdata(dev); struct sdhci_host *host = dev_get_priv(dev); @@ -94,7 +139,9 @@ static int sdhci_cdns_probe(struct udevice *dev) host->ioaddr = plat->hrs_addr + SDHCI_CDNS_SRS_BASE; host->quirks |= SDHCI_QUIRK_WAIT_SEND_CMD;

- sdhci_cdns_phy_init(plat); + ret = sdhci_cdns_phy_init(plat, gd->fdt_blob, dev->of_offset); + if (ret) + return ret;

ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0); if (ret)